2640002657 has 2 divisors, whose sum is σ = 2640002658. Its totient is φ = 2640002656.

The previous prime is 2640002647. The next prime is 2640002681. The reversal of 2640002657 is 7562000462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1840753216 + 799249441 = 42904^2 + 28271^2 .

It is a cyclic number.

It is not a de Polignac number, because 2640002657 - 2⁶ = 2640002593 is a prime.

It is a super-2 number, since 2×2640002657² = 13939228057934119298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2640002647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320001328 + 1320001329.

It is an arithmetic number, because the mean of its divisors is an integer number (1320001329).

Almost surely, 2^2640002657 is an apocalyptic number.

It is an amenable number.

2640002657 is a deficient number, since it is larger than the sum of its proper divisors (1).

2640002657 is an equidigital number, since it uses as much as digits as its factorization.

2640002657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 2640002657 is about 51380.9561705502. The cubic root of 2640002657 is about 1382.0851096636.

The spelling of 2640002657 in words is "two billion, six hundred forty million, two thousand, six hundred fifty-seven".